topic Re: Slope / extrude buildings in ArcGIS CityEngine Questions

Slope / extrude buildings

Joao_PedroMarques — Fri, 27 Jan 2017 16:53:55 GMT

Hi!

What is the best way to get building / rooftops aligned?

Like this:

My example:

Is there any command to get the rooftop correctly aligned, regarding the slope on the terrain?

Thank you guys.

Best,

Re: Slope / extrude buildings

LR — Fri, 27 Jan 2017 23:24:39 GMT

extrude(world.up.flatTop, value)

Re: Slope / extrude buildings

Joao_PedroMarques — Sat, 28 Jan 2017 14:46:42 GMT

I'm currenty using this cga for the building correct heights (based on geodatabase atrributes) :

#initalize attribute set to a particular value or 0
attr NPisos = 10
attr avgFloorHeight = 3

@StartRule
Lot --> extrude(NPisos * avgFloorHeight)

NPisos is Number of floors.

How can i add that line in my cga? What would be the value?

Thank you

Re: Slope / extrude buildings

DevinLavigne — Sat, 11 Dec 2021 15:47:05 GMT

Just building off the comment from Rasa Ra it would be something like this:

#initalize attribute set to a particular value or 0

attr NPisos = 10
attr avgFloorHeight = 3

@StartRule 
Lot --> extrude(world.up.flatTop, NPisos * avgFloorHeight) ‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Slope / extrude buildings

Joao_PedroMarques — Sat, 28 Jan 2017 20:03:08 GMT

Thank you David, but something is missing.

i found the topic in the help faq: Help -

But still cant figure it how to work

Re: Slope / extrude buildings

BenLeslie1 — Mon, 30 Jan 2017 07:58:55 GMT

Are you using CE 2016? - I think flatTop CGA was only introduced at 2016.

When you align shapes to terrain, instead of projecting, use translate to minimum then extrude the building through the terrain. I don't know if there's another way to replicate flatTop.

Re: Slope / extrude buildings

Joao_PedroMarques — Mon, 30 Jan 2017 14:45:55 GMT

Hi Ben,

Yes i'm using 2016.1 and even when i use the translate to minimum i get the same result.

Re: Slope / extrude buildings

ThomasFuchs — Sat, 11 Dec 2021 15:47:08 GMT

Joao Pedro Marques‌ This rule should give you a building on a leveled lot at the minimum of sloped shapes:

attr buildingHeight = 15

@StartRule
Lot -->
     alignScopeToAxes(y) s('1,0,'1)
     extrude( buildingHeight )‍‍‍‍‍‍‍‍‍‍‍‍

Re: Slope / extrude buildings

Joao_PedroMarques — Sun, 05 Feb 2017 16:18:18 GMT

It worked!1

Tahnk you so much, Thomas!